7. Recommended Interface Circuit (AC Coupling)
| TXGND |
| TxD |
Laser |
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Driver | TxD |
9
R1
8
7
VCC SerDes
3.3V
R2
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VCC
TX+
ECL/PECL
VCCTx |
Delta Transceiver |
R3
6
| C5 | R6 |
| R5 | |
L2 | VCC SerDes |
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TX-
DRIVER
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C1
5
C2
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3
2 |
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1 | R7 | |
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3.3V |
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C3 |
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L1 |
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SD to upper leve l |
| R10 |
R13 | R9 | |
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C6 | R11 |
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C7 |
| R12 |
R8 |
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Serializer/
Deserializer
RD-
| Receiver |
RD+ | PLL etc. |
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C1/2/3 | = 4.7 uF |
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C4/5/6/7 | = 100 nF |
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L1/2 | = 1 uH |
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R1/2 | =82 Ω (If C4/5=0, then R1/2 =130 Ω, it is for | |
R3/4 | =130 Ω (If C4/5=0, then R3/4 =82 Ω, it is for | |
R7/8 | =150 Ω |
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R5/6/9/10/11/12 | Depend on SerDes chip used | |
R13 | = 270 Ω |
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Value of R5/6/9/10/11/12 may vary as long as proper 50 Ω termination or differential 100 Ω is provided. For good EMI performance, the power supply filter is required. Use shorter tracks from the inductor L1/2 to the module VccTx/VccRx .
5 | Revision: S2 |
| 03/09/2007 |
DELTA ELECTRONICS, INC. | www.deltaww.com |